tms470r1a256_adc10_08.c

tmp470开发板的源程序

//******************************************************************************
//  Functional
//  TMS470 Demo - MibADC Sample ADIN0 single conversion
//
//  Description; A single sample is made on ADIN0 with reference to AVcc/AVss.
//  Software sets starts sample and conversion and polls for end of conversion.
//
//  Total sample and convert time = 1sec / (12MHz/(8*((62+2)+11))) = 50uSec
//  ACLK = SYSCLK = MCLK = ICLK = 12MHz
//  //*An external 12Mhz XTAL on OSCIN OSCOUT with proper load caps required*//	
//
//              TMS-FET470A256
//             -----------------
//         /|\|            OSCIN|-
//          | |                 | 12MHz
//          --|PLLDIS     OSCOUT|-
//            |                 |
//        >---|ADIN0            |
//            |                 |
//
//  L.Westlund/J.Mangino
//  Texas Instruments, Inc
//  January 2005
//  Built with IAR Embedded Workbench Version: 3.20A
//******************************************************************************

#include <intrinsic.h>
#include "iotms470r1a256.h"
#include "tms470r1a256_bit_definitions.h"

void main(void)
{

  PCR = CLKDIV_1 + PENABLE;               // ICLK = SYSCLK, enable peripherals

  ADCR1 |= PS_8;                          // ADCLK prescaler = 8
  ADSAMPEV |= SEN;                        // ADCSAMP1 controls SW
  ADSAMP1 = 62;                           // SW = 62+2
  ADCR1 |= ADC_EN;                        // Enable ADC
  ADISR1 = 0x0001;                        // Convert croup 1 = channel 0

  while (!(ADSR & GP1_END));              // Wait for conversion to complete
  ADSR |= GP1_END;                        // Clears flag
  __no_operation();                       // SET BREAKPOINT HERE TO READ ADDR0

}